Fix I2C read stobe timing and add more elaborate tests for reads.

Minor I2C cleanup.

Fix typo in documentation.

Set I2C MultiReg reset state back to 1.

Fixed most issues with i2c slave read. Still a problem with the stop bit, but be a test bug.

Specify part number for J4.

Fix u1 capacitors to be 0603, not 0201. Fuck's sake.

Implement read half of i2c slave

Simplify stop strobe generation.

Implement write half of I2C slave.